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2013-10-02

A New Imaging Algorithm for Geosynchronous SAR Based on the Fifth-Order Doppler Parameters

By Bingji Zhao, Yunzhong Han, Wenjun Gao, Yunhua Luo, and Xiaolei Han
Progress In Electromagnetics Research B, Vol. 55, 195-215, 2013
doi:10.2528/PIERB13072803

Abstract

This paper proposes a new imaging algorithm based on a novel accurate range model to process the data acquired by Geosynchronous-Earth-orbital Synthetic Aperture Radar (Geo-SAR). The new range model, called DRM-5, is obtained from the 1-5th order Doppler parameters of spaceborne SAR. It is employed to describe the slant range of Geo-SAR during the super-long integration time. Furthermore, the two-dimensional frequency spectrum of point targets based on the new range model is derived and analyzed. An advanced Frequency Domain Algorithm (FDA) based on DRM-5 is proposed to process the data of stripmap mode Geo-SAR. The varied Doppler parameters in the cross-azimuth direction are considered in the new imaging algorithm, and the space-varied range-azimuth coupling phase term is compensated through data blocking. A simulation experiment is performed to verify the efficiency and superiority of the new algorithm, and the results show that it has a good effect on an L-band stripmap mode Geo-SAR system with azimuth resolution around 5m and 300km range swath.

Citation


Bingji Zhao, Yunzhong Han, Wenjun Gao, Yunhua Luo, and Xiaolei Han, "A New Imaging Algorithm for Geosynchronous SAR Based on the Fifth-Order Doppler Parameters," Progress In Electromagnetics Research B, Vol. 55, 195-215, 2013.
doi:10.2528/PIERB13072803
http://jpier.org/PIERB/pier.php?paper=13072803

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